:root{--ink: #151922;--muted: #667085;--paper: #f2f5f8;--panel: #fbfcfd;--panel-strong: #fff;--line: #d5dae3;--line-strong: #c8d1de;--accent: #b55234;--accent-2: #0b776d;--accent-3: #255c99;--danger: #b42318;--radius: 8px;--radius-sm: 6px;--shadow: 0 16px 40px rgba(21, 25, 34, .13);--soft-shadow: 0 8px 18px rgba(32, 34, 40, .06);color:var(--ink);font-family:Avenir Next,Helvetica Neue,Arial,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0;background:linear-gradient(#fffc,#f7fafce6),linear-gradient(90deg,rgba(21,25,34,.055) 1px,transparent 1px),linear-gradient(rgba(21,25,34,.055) 1px,transparent 1px),var(--paper);background-size:auto,40px 40px,40px 40px,auto}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.75}.studio-shell{width:min(100vw - 24px,1800px);min-height:100vh;margin:0 auto;padding:10px 0 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button:hover{border-color:#255c9959;color:#174a7c}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:30;display:grid;place-items:center;background:#0a0a09db;padding:28px}.lightbox-card{display:grid;gap:10px;width:min(96vw,1400px);max-height:92vh;margin:0;place-items:center}.lightbox-card img{display:block;max-width:100%;max-height:86vh;border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);background:#111;object-fit:contain}.lightbox-card figcaption{max-width:860px;color:#fff;font-size:13px;line-height:1.55;text-align:center}.lightbox-close{position:fixed;top:18px;right:18px;width:42px;height:42px;border:1px solid rgba(255,255,255,.48);border-radius:50%;background:#ffffff1f;color:#fff;font-size:28px;line-height:1}.toast{position:fixed;bottom:24px;left:50%;z-index:10;width:max-content;max-width:min(560px,100vw - 36px);border:1px solid var(--line);border-left:4px solid var(--accent-3);border-radius:var(--radius);background:#fff;color:var(--ink);padding:12px 14px;box-shadow:0 14px 36px #15192229;font-size:14px;font-weight:800;opacity:0;transform:translate(-50%,12px);transition:opacity .18s,transform .22s cubic-bezier(.16,1,.3,1);pointer-events:none}.toast.show{opacity:1;transform:translate(-50%)}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (min-width: 1281px){.workspace.controls-collapsed{grid-template-columns:minmax(340px,.86fr) minmax(520px,1.9fr) 72px}}@media (max-width: 1280px){.workspace{grid-template-columns:minmax(320px,.95fr) minmax(360px,1.05fr)}.control-panel{grid-column:1 / -1;min-height:auto}.controls-stack{grid-template-columns:repeat(2,minmax(0,1fr));align-items:end}.controls-stack>.select-field:first-child,.controls-stack>.select-field:nth-child(3),.validation-line,.segmented.four{grid-column:1 / -1}}@media (max-width: 860px){.studio-shell{width:min(100vw - 10px,760px);padding-top:10px}.topbar,.workspace,.two-col,.upload-grid{grid-template-columns:1fr}.topbar{min-height:0}.brand-group{flex-wrap:wrap}.version-pill{margin-top:0}.topbar-api-key{padding:14px}.panel,.stage-panel,.control-panel{min-height:0;padding:14px}.brief-head{grid-template-columns:1fr;align-items:stretch}.brief-head .primary-button{width:100%;min-height:36px}textarea{min-height:280px}.preview-frame{min-height:320px}.controls-stack{grid-template-columns:1fr}.history-head{display:grid;grid-template-columns:1fr}.history-search,.history-clear-button{width:100%;margin-left:0}}@media (max-width: 520px){.brand-mark{width:36px;height:36px;box-shadow:3px 3px 0 var(--ink)}h1{font-size:27px}h2{font-size:24px}.panel,.stage-panel,.control-panel,.history-panel{border-radius:10px}.quick-prompts{grid-template-columns:1fr}.segmented.four{grid-template-columns:repeat(2,1fr)}.result-toolbar{grid-template-columns:1fr}.result-toolbar button,.result-toolbar button:nth-child(2),.result-toolbar span{justify-self:stretch;width:100%}}